Enhanced Charge-Transport Behavior on PbS Nanocrystals Capped with Atomic Ligands. (8th September 2015)

• Record Type: Journal Article
• Authors: Yoon, Seongwon; Ha, Jae Un; Cho, Jangwhan; Chung, Dae Sung
• Is Part Of: ECS transactions. Volume 69:Number 5(2015)
• Page Start: 95
• Page End: 99
• Publication Date: 2015-09-08
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/06905.0095ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : In order to enhance charge-transport nanocrystal (NC) arrays, long and insulating ligands have to be replaced by short and electronically transparent ligands. Traditionally, benzene dithiol or mercaptopropionic acid have been frequently used as such surface ligands to overcome low charge-carrier mobility issues that affect colloidal NCs. However, the resulting devices usually exhibit a limited enhanced mobility of ~0.01 cm 2 /Vs. In this study, to realize a high charge-carrier mobility over 0.1 cm 2 /Vs, we demonstrate the utilization of atomic ligands such as halide anions (X -, X : Cl, Br, I) as electrically transparent ligands for lead chalcogenide NCs. We discuss the origin of such improved charge-transport behavior, which results from the introduction of atomic ligands, as well as various characterization results.